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Devatec > Humidification > Glossary |
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Glossary |
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Absolute humidity : Absolute humidity refers to the mass of water in a particular volume of air. It is expressed in g/kg of dry air. Relative Humidity (RH) : The ratio of the vapor pressure (or mole fraction) of water vapor in the air to the vapor pressure (or mole fraction) of saturated air at the same dry-bulb temperature and pressure. Sensible Heat : Heat that when added to or taken away from a substance causes a change in temperature or, in other words, is "sensed" by a thermometer. Measured in kJ. Latent Heat : Heat that when added to or taken away from a substance causes or accompanies a phase change for that substance. This heat does not register on a thermometer, hence its name "latent" or hidden. Measured in kJ. Water conductivity : Conductivity is a measurement of the ability of an aqueous solution to carry an electrical current. It is expressed in µS/cm. Water conductivity : Conductivity is a measurement of the ability of an aqueous solution to carry an electrical current. It is expressed in µS/cm. Dew Point : The temperature at which condensation occurs (100%RH) when air is cooled at a constant pressure without adding or taking away water vapor. Evaporative Cooling : A process in which liquid water is evaporated into air. The liquid absorbs the heat necessary for the evaporation process from the air, thus, there is a reduction in air temperature and an increase in the actual water vapor content of the air. Enthalpy : Also called heat content, this is the sum of the internal energy and the product of the volume times the pressure. Measured in kJ/kg. Hygroscopic Materials : Materials capable of absorbing or giving up moisture. Phase : The states of existence for a substance, solid, liquid, or gas (vapor). |
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